On Tue, May 17, 2016 at 10:32:05PM +0800, Anand Jain wrote:
> This patch provides functions
> _scratch_dev_pool_get()
> _scratch_dev_pool_put()
>
> Which will help to set/reset SCRATCH_DEV_POOL with the required
> number of devices. SCRATCH_DEV_POOL_SAVED will hold all the devices.
>
> Usage:
> _scratch_dev_pool_get() <ndevs>
> :: do stuff
>
> _scratch_dev_pool_put()
>
> Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
I'm not sure about the usefulness and the implementation of these
helpers (include the _spare_dev_get|_put helpers), but they look good to
me. It'd better to have btrfs developers review them as well.
> ---
> common/rc | 47 +++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 47 insertions(+)
>
> diff --git a/common/rc b/common/rc
> index 91e8f1c8e693..33632fd8e4a3 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -786,6 +786,53 @@ _scratch_mkfs()
> esac
> }
>
> +#
> +# $1 Number of the scratch devs required
> +#
Some comments about its usage/purpose would be good, otherwise one has
to search for the commit log and look into it to understand its purpose
> +_scratch_dev_pool_get()
> +{
> + if [ $# != 1 ]; then
> + _fail "Usage: _scratch_dev_pool_get ndevs"
> + fi
> +
> + local test_ndevs=$1
> + local config_ndevs=`echo $SCRATCH_DEV_POOL| wc -w`
> + local devs[]="( $SCRATCH_DEV_POOL )"
> +
> + typeset -p config_ndevs >/dev/null 2>&1
> + if [ $? != 0 ]; then
> + _fail "Bug: unset val, must call _scratch_dev_pool_get before _scratch_dev_pool_put"
This error message seems confusing, it's _scratch_dev_pool_get being
called here, not _put.
> + fi
> +
> + # _require_scratch_dev_pool $test_ndevs
> + # must have already checked the min required devices
> + # but just in case, trap here for any potential bugs
> + # perpetuating any further
> + if [ $config_ndevs -lt $test_ndevs ]; then
> + _notrun "Need at least test requested number of ndevs $test_ndevs"
This message is not clear to me either.
Thanks,
Eryu
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